Multi-surface step shield translation construction method

Abstract

The present application relates to the technical field of tunnel shield translation construction, in particular to a multi-section step shield translation construction method. The present application provides a multi-section step shield translation construction method, by setting a first corbel and a second corbel on both sides of a shield body, and setting the second corbel on the side of the first corbel away from the center line of the shield body, so that when the wheels at the bottom of the first corbel pass through the junction of different high-difference sections along the track, the shield body can be lifted by setting a jack at the bottom of the second corbel, the support system of the shield body is converted, the first platform in the lower elevation section is conveniently installed and removed, the first corbel is raised, the wheels at the bottom of the first corbel are adapted to the low-section base surface, and the problem of affecting the passing of the shield through the station due to the failure of the track to be smoothly connected is solved.

Description

Technical Field

[0001] This invention relates to the field of tunnel shield translation construction technology, and in particular to a method for translation construction of multi-section step shields. Background Technology

[0002] Due to its immunity to weather conditions and its advantages of safety, high degree of automation, and high efficiency, the tunnel boring machine (TBM) remains the most commonly used construction method for subway tunnels. Considering the convenience of public transportation, subway stations are often spaced close together, characterized by numerous stations and short sections. To improve construction efficiency and shorten the construction period, the TBM can continuously excavate 2-3 subway sections after its initial launch, thereby reducing the number of launches and receptions, saving costs and time. Therefore, after completing one section, the TBM needs to pass through a station. Improving the efficiency of the TBM passing through stations becomes a major issue affecting the construction period.

[0003] Traditional shield tunneling technology is mostly designed for short-distance station crossings (<100m). This involves laying temporary tracks or sliding steel plates on the station floor to reduce frictional resistance, and using reaction frames or temporary supports rigidly connected to the station's main structure to provide the thrust for the shield. However, in mining tunnel construction, to adapt to complex geological conditions, control surrounding rock deformation, improve construction safety, and balance economy and flexibility, multi-section, multi-stage excavation methods (such as four-section phased construction) are often adopted. Due to different backfill heights at each section, longitudinally uneven base surfaces are formed. The shield machine needs to move long distances when crossing stations in mining tunnel sections, but existing track laying cannot dynamically adapt to the backfill height differences across multiple sections. Repeated adjustments to the track elevation affect the continuity of shield advancement, and traditional reaction frames cannot meet the long-distance thrust requirements of mining tunnel sections.

[0004] Therefore, for multi-section environments in mining tunnels, it is necessary to continue to optimize the method of rapid tunneling of shield machines. Summary of the Invention

[0005] The purpose of this invention is to provide a method for the horizontal movement of a multi-section stepped shield tunnel, which addresses the problem that the track laying cannot be smoothly connected due to the elevation difference between the base surfaces of multiple sections in mining tunnels, thus affecting the passage of the shield tunnel.

[0006] This invention provides a method for the translational construction of multi-section stepped shield tunnels, comprising the following steps:

[0007] S1: A wheel, a first bracket, and a second bracket are respectively installed at the bottom of the shield body. The first bracket and the second bracket are integrally connected to the shield body. The second bracket is located on the side of the first bracket away from the center line of the shield body. The wheel is integrally connected to the bottom of the first bracket. S2: Drive the shield body to move along the track on the first section to the junction with the second section, where the bottom elevation of the first section is higher than the bottom elevation of the second section; First, a first platform is erected on the second section, so that the top surface of the first platform and the bottom elevation of the first section are at the same level. Then, a track is laid on the first platform to connect with the track on the first section. Then, the wheels of the shield in front of the shield body are driven to pass through the first section and stop on the first platform. S3: At the second corbel position, use lifting jacks to raise the entire shield body. The lifting jacks are located outside the first platform, that is, the first platform does not occupy the space under the second corbel where the lifting jacks are set. Then, remove the first platform, set a temporary track at the original position of the first platform, connect the temporary track with the track in the second section, and raise the first corbel on the front shield to make up for the height difference between the first section and the second section. S4: Drive the lifting jack to restore the shield to its original height. The wheels of the raised front shield work with the temporary track to move the shield forward. Remove the temporary track and place the first platform in its original position. S5: Drive the wheels of the shield in the shield body through the first section and stop on the first platform. Repeat step S3, raise the first bracket on the shield, and retract the lifting jack to move the shield body to the second section.

[0008] This invention involves constructing a first platform at the junction of a first and second cross-section with a height difference, making the first platform flush with the higher second cross-section. This facilitates the laying of tracks on the first platform to connect with the tracks on the first cross-section, providing construction conditions for the shield to move to the tunnel section containing the first cross-section. After the shield has moved to the tunnel section containing the first cross-section using the first platform and its tracks, lifting jacks are used to support second brackets on different cross-section bases, raising the entire shield and achieving a conversion of the shield support system. Under the support of the lifting jacks, the first platform is dismantled to facilitate processing. The first bracket on the front shield compensates for the height difference between the first and second sections. At the same time, by setting a temporary track at the original position of the dismantled first platform to connect with the track on the base surface of the second section, the shield body can move its raised front shield wheels along the temporary track to the track on the base surface of the second section after it is restored to its original height. When the temporary track is removed, the first platform is restored, and the lifting jacks are retrieved, the raised front shield wheels and the middle shield wheels are supported on the base surface of the second section and the first platform, respectively, to compensate for the height difference in the same way, thereby completing the translation of the entire shield body across different height difference sections.

[0009] Preferably, before step S1, the present invention further includes the steps of backfilling the launching well pit and setting the launching bracket.

[0010] Preferably, C35 concrete is used for backfilling the launching well pit.

[0011] Preferably, one end of the launching bracket is connected to the cross-sectional cut, and the other end is connected to the side wall of the launching well through double H-beams to reinforce the launching bracket.

[0012] Preferably, step S1 further includes the following steps: setting a trapezoidal groove adapted to the shield body profile on the base surface of the cross section adjacent to the starting shaft pit, setting a steel plate on the bottom surface of the trapezoidal groove, and installing a steel rail on the steel plate to support the shield's translation. The ends of the steel plate are welded and fixed to the starting bracket to prevent the steel plate from moving forward due to excessive friction when the shield is translated. The shield body is pushed from the launching bracket onto the rail.

[0013] By setting trapezoidal grooves on different cross-sectional base surfaces, structural interference between the bottom contour of the shield body and the cross-sectional base surface is avoided. By setting steel plates in the trapezoidal grooves on the cross-sectional base surface near the launching shaft pit and setting steel rails on the steel plates, the shield body pushed out from the launching bracket can be used to support the shield body, avoid direct contact between the shield body and the base surface, reduce friction, and facilitate the subsequent installation of brackets and wheels on both sides of the shield body.

[0014] Preferably, in step S1, the wheels are installed after the shield body is moved onto the rail: the shield is raised using jacks, the wheels are installed, and a track is installed at the bottom of the wheels so that the shield body moves along the track.

[0015] Preferably, the present invention further includes a step of setting a temporary pad between the second corbel and the base surface during the process of raising the tunnel boring machine, in order to prevent the jack from retracting when welding the wheels and to ensure welding safety.

[0016] Preferably, after step S5, the present invention further includes the step of lowering the shield onto the rail: S61: Construct a second platform on both sides of the starting position and lay tracks on the second platform to move the shield body to the shield starting position section; S62: Under the second bracket, extend the hydraulic cylinder of the lifting jack to its maximum stroke, and place a pad between the lifting jack and the second bracket. With the support of the lifting jack and the pad, remove the raised part of the second platform and the first bracket. S63: Retract the lifting jack and place the wheels back on the track of the second platform; S64: With the support of the wheels, remove the pad cylinder so that the lifting jack can be extended again to support the second bracket. S65: With the support of the lifting jack, the second platform and wheels are removed again; S66: Retract the lifting jacks again to bring the shield into contact with the rails. The rails are those installed in the initial stage of the tunnel boring machine to support the shield.

[0017] Preferably, the present invention further includes a backfilling step: the tunnel boring machine is moved to the starting end position, and then the starting well opening and the grooves of each section are backfilled to the designed height.

[0018] Due to the poor stability of the surrounding rock in mining tunnel sections, settlement or deformation of the support structure is easily triggered when passing through stations. This invention adopts a method of first moving the shield body and then backfilling. This method allows for the temporary support between steps to be retained by moving the shield body first, ensuring the stability of the surrounding rock. After the shield body is in place, it is then dismantled and backfilled in stages. If the entire cross-section is backfilled to the design elevation first, it is necessary to wait for the backfill concrete to cure to its strength (usually 7-14 days), which significantly extends the construction period. However, by moving the shield body first and then backfilling, the shield body movement can be carried out simultaneously with other cross-section support and backfilling processes, realizing multi-face collaboration and shortening the critical path time.

[0019] Preferably, the present invention further includes the following steps: after the backfill section is completed, the installation track is used to transport the tunnel boring machine trolley to the starting position, and the tunnel boring machine trolley is connected to the shield body for debugging.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for the translational construction of a multi-section stepped shield tunnel. By setting a first bracket and a second bracket on both sides of the shield body, and placing the second bracket on the side of the first bracket away from the center line of the shield body, the shield body can be lifted by setting jacks at the bottom of the second bracket when the wheels at the bottom of the first bracket pass through the intersection of different elevation sections along the track. This realizes the transformation of the shield support system, facilitates the installation and dismantling of the first platform in the lower elevation section, and provides construction conditions for raising the first bracket so that its bottom wheels can adapt to the lower section base surface. This solves the problem of shield tunneling being affected by the inability to smoothly connect the track laying. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the longitudinal profile of a multi-step, multi-section station in a certain section, as shown in the example. Figure 2 A schematic diagram of the plan layout for reinforcing the initial support bracket; Figure 3 A cross-sectional view showing the welding and dimensions of the shield body's "column" support; Figure 4 A schematic diagram of the structure for reserving a groove in section F; Figure 5 for Figure 4 A structural diagram showing the pre-reserved groove for installing steel plates and rails; Figure 6 A schematic diagram of the overall structure when a groove is reserved in section F to support the shield body; Figure 7 This is a diagram showing the placement of the temporary pads; Figure 8 A schematic diagram showing the location of the grooves reserved between the shield body and sections E and D after the shield body is raised. Figure 9 Profile of the backfill elevation difference between sections D and G; Figure 10 Longitudinal sectional view of the platform erected for section G; Figure 11 Cross-sectional view of the platform at section G; Figure 12 A schematic diagram of the structure supporting the shield body on the track after raising the wheels by 0.35m; Figure 13 This is a schematic diagram of the shield structure after it reaches the starting point. Figure 14 A schematic diagram of the shield body when it is lowered to the initial launch elevation; Figure 15 This is a schematic diagram of the wellhead and groove backfilling.

[0022] Markings in the diagram: 1-First bracket; 2-Second bracket; 3-Lifting jack; 4-Wheel; 5-Shield body; 6-First platform; 7-Trapezoidal groove; 8-Steel plate; 9-Steel rail; 10-Railway; 11-Temporary pad; 12-H-beam; 13-Starting bracket. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0024] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0025] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0026] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0027] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0028] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0029] Example like Figures 1-15 As shown, a method for multi-section stepped shield tunneling translation construction includes the following steps: S1: Wheels 4, first bracket 1 and second bracket 2 are respectively installed at the bottom of the shield body 5. The first bracket 1 and the second bracket 2 are integrally connected to the shield body 5. The second bracket 2 is located on the side of the first bracket 1 away from the center line of the shield body. The wheels 4 are integrally connected to the bottom of the first bracket 1. S2: Drive the shield 5 to move along the track 10 on the first section to the junction with the second section, where the bottom elevation of the first section is higher than the bottom elevation of the second section; First, a first platform 6 is erected on the second section so that the top surface of the first platform 6 and the bottom elevation of the first section are at the same level. Then, a track 10 is extended and laid on the first platform 6 to connect with the track 10 on the first section. Then, the wheels 4 of the front shield of the shield body 5 are driven to pass through the first section and stop on the first platform 6. S3: At the position of the second corbel 2, the lifting jack 3 is used to raise the shield body 5 as a whole. The lifting jack 3 is located outside the first platform 6. Then the first platform 6 is removed, and a temporary track is set at the original position of the first platform 6 so that the temporary track is connected with the track 10 in the second section. The first corbel 1 on the front shield is raised to make up for the height difference between the first section and the second section. S4: Drive the lifting jack 3 to restore the shield body 5 to its original height. The wheels 4 of the front shield after being raised cooperate with the temporary track to move the shield body 5 forward. Remove the temporary track and place the first platform 6 in its original position. S5: Drive the wheel 4 of the shield in the shield body 5 through the first section and stop on the first platform 6. Repeat step S3, raise the first bracket 1 on the shield, and retract the lifting jack 3 to move the shield body 5 to the second section.

[0030] In this embodiment, a first platform 6 is erected at the junction of a first section and a second section with a height difference, making the first platform 6 flush with the higher second section. This facilitates the laying of a track 10 on the first platform 6 to connect with the track 10 on the first section, providing construction conditions for the shield body 5 to move to the tunnel section of the first section. After the shield body 5 moves to the tunnel section of the first section using the first platform 6 and the track 10, the second bracket 2 is supported by lifting jacks 3 on different section base surfaces to raise the shield body 5 as a whole, realizing the transformation of the shield support system. Under the support of the lifting jacks 3, the first platform 6 is dismantled to facilitate the addition of... The first bracket 1 on the shield before construction compensates for the height difference between the first and second sections. At the same time, by setting a temporary track at the original position of the dismantled first platform 6 to connect with the track 10 in the second section, after the shield body 5 is restored to its original height, the wheels 4 of the front shield part after being raised can move along the temporary track to the track 10 at other positions in the second section. When the temporary track is removed, the first platform 6 is restored, and the lifting jack 3 is retrieved, the wheels 4 of the front shield and the wheels 4 of the middle shield of the shield body 5 are supported on the base surface of the second section and the first platform 6 respectively, and the height difference is compensated in the same way, thereby completing the translation of the entire shield body 5 in sections with different height differences.

[0031] In step S2 above, the first platform 6 can be erected in advance before the shield 5 reaches the junction of the first section and the second section, and then the shield 5 can be moved horizontally. Alternatively, the construction can be delayed according to the construction conditions, that is, the first platform 6 can be erected after the shield 5 reaches the junction of the first section and the second section. Or the first platform 6 can be carried out simultaneously with the shield movement operation (within the first section).

[0032] In one or more embodiments, when the shield body 5 is driven to translate along the track 10, a rail clamp can be fixedly installed on the track 10. The rail clamp is detachably connected to the track 10, and the base of the jack is welded and fixed to the rail clamp. Correspondingly, a baffle is set behind the shield body 5. The jack, supported by the rail clamp, pushes the baffle, which is integrally set with the shield body 5, so that the shield body 5 can move forward longitudinally. After the shield body 5 has moved forward a certain distance, the jack is retracted, the rail clamp is placed close to the shield body 5, and the pushing is repeated. This process is repeated to drive the shield body 5 forward, adapting to the long-distance pushing requirements of the tunnel.

[0033] In one or more embodiments, prior to step S1, the method further includes the steps of backfilling the launching well pit and setting the launching bracket 13.

[0034] In an optional implementation, C35 concrete is used for backfilling the launching well pit.

[0035] In this embodiment, it is preferable to connect one end of the launching bracket 13 to the cross-sectional cut and the other end to the side wall of the launching well through double H-beams 12 to reinforce the launching bracket 13.

[0036] Step S1 also includes the following steps: setting a trapezoidal groove 7 adapted to the outline of the shield body 5 on the base surface of the cross section adjacent to the starting shaft pit, setting a steel plate 8 on the bottom surface of the trapezoidal groove 7, and installing a steel rail 9 on the steel plate 8 to support the shield translation, and welding and fixing the end of the steel plate 8 to the starting bracket 13 to prevent the steel plate 8 from moving forward due to excessive friction when the shield is translated; The shield 5 is pushed from the launching bracket 13 onto the rail 9.

[0037] By setting trapezoidal grooves 7 on different cross-sectional base surfaces, structural interference between the bottom contour of the shield body 5 and the cross-sectional base surface is avoided. By setting steel plates 8 in the trapezoidal grooves 7 on the cross-sectional base surface near the launching shaft pit and setting steel rails 9 on the steel plates 8, it can be used to support the shield body 5 pushed out from the launching bracket 13, avoiding direct contact between the shield body 5 and the base surface, reducing friction, and facilitating the subsequent installation of brackets and wheels 4 on both sides of the shield body 5.

[0038] In step S1, after the shield body 5 is moved onto the rail 9, the wheels 4 are installed: the shield is raised using jacks, the wheels 4 are installed, and the rail 10 is installed at the bottom of the wheels 4 so that the shield body 5 moves along the rail 10.

[0039] In this embodiment, during the process of raising the shield tunnel, a temporary pad 11 is also set between the second corbel 2 and the base surface to prevent the jack from retracting when welding the wheel 4, thus ensuring welding safety.

[0040] Following step S5, this embodiment further includes the step of lowering the shield 5 onto the rail 9: S61: Construct a second platform on both sides of the starting position and lay track 10 on the second platform to move the shield body 5 to the shield starting position section. S62: Under the second bracket 2, extend the hydraulic cylinder of the lifting jack 3 to its maximum stroke, and place a pad between the lifting jack 3 and the second bracket 2. Under the support of the lifting jack 3 and the pad, remove the raised part of the first bracket 1. S63: Retract the lifting jack 3 and place the wheel 4 back on the track 10 of the second platform; S64: With the support of wheel 4, remove the pad cylinder so that the lifting jack 3 can be extended again to support the second bracket 2; S65: With the support of the lifting jack 3, the second platform and wheel 4 are removed again; S66: Retract the lifting jack 3 again to bring the shield 5 into contact with the rail 9.

[0041] After step S5, this embodiment also includes a backfilling step: the tunnel boring machine is moved to the starting end position, and then the starting well opening and the grooves of each section are backfilled to the design height.

[0042] Due to the poor stability of the surrounding rock in mining tunnel sections, settlement or deformation of the support structure is easily triggered when passing through stations. In this embodiment, a method of first moving the shield body and then backfilling is adopted. This method involves first moving the shield body 5 while retaining temporary support between the steps to ensure the stability of the surrounding rock. After the shield body 5 is in place, it is then dismantled and backfilled in stages. If the entire cross-section is backfilled to the design elevation first, it is necessary to wait for the backfill concrete to cure to its strength (usually 7-14 days), which significantly extends the construction period. However, by moving the shield body 5 first and then backfilling, the movement of the shield body 5 can be carried out simultaneously with other cross-section support and backfilling processes, realizing multi-face collaboration and shortening the critical path time.

[0043] This embodiment also includes the following steps: after the backfill section is completed, the installation track 10 is used to transport the tunnel boring machine trolley to the starting position, and the tunnel boring machine trolley is connected to the shield body 5 for debugging.

[0044] This method involves setting up a first bracket 1 and a second bracket 2 on both sides of the shield body 5, with the second bracket 2 positioned on the side of the first bracket 1 furthest from the centerline of the shield body. This allows the shield body 5 to be lifted by jacks at the bottom of the second bracket 2 when the wheels 4 at the bottom of the first bracket 1 pass through the intersection of different elevation sections along the track 10. This enables the shield body 5 to be converted into a support system, facilitates the installation and removal of the first platform 6 in the lower elevation section, and provides construction conditions for raising the first bracket 1 so that the wheels 4 at its bottom can adapt to the lower elevation section base. This also solves the problem of the shield tunneling machine being unable to pass through the station due to the inability to smoothly connect the track 10.

[0045] The following explanation uses a tunnel boring machine (TBM) passing through a station in a certain section as an example: The left-line shield tunneling in a certain section started from within a mining method tunnel. After assembly and debugging in the launching shaft, the shield was moved horizontally across four sections (F, E, D, and G) of the mining method tunnel to the tunnel face for its final launch. The total horizontal movement length was 72m. Figure 1 As shown.

[0046] Step 1: Backfilling of the starting well foundation pit First, the foundation pit of the launching shaft will be backfilled to the planned height (1.207m below the rail surface), and the concrete will be C35 concrete according to the design grade.

[0047] Step 2: Installation and reinforcement of the starting bracket 13 First, based on the tunnel centerline surveyors, the placement position of the launching bracket 13 was determined. Second, to ensure that the shield tunneling machine does not rub against the secondary lining wall of section F during its translation, the launching bracket 13 was planned to be placed 10cm to the right of the greater mileage direction of the tunnel, with one end of the bracket connecting to the cut at section F. The bracket was reinforced with 220mm steel. 220mm H-beams, 12 double-section reinforcement, such as Figure 2 As shown. Use 50 series welding rods, ensure a full weld, and employ full welding.

[0048] Step 3: Welding the "columns" of the shield body. "Colts" are welded to the front and back of both sides of shield body 5, such as... Figure 3 As shown, the support structure includes a first support 1 and a second support 2. The first support 1 is used to weld and connect wheels 4 at the bottom, and the second support 2 is used for jack lifting support. The second support 2 is located on the side of the first support 1 away from the center line of the shield. The support is made of 2cm steel plate 8; the 200T jack is 0.5m high, 0.28m in diameter, and has a maximum cylinder extension of 0.45m. The jack can be installed separately from the second support 2 or as an integral part of it. The supports are installed corresponding to the positions of the front shield and the middle shield, respectively.

[0049] Step 4: Rail Layout for Section F of the Mining Tunnel A trapezoidal groove 7 is pre-reserved along the center line of the tunnel at section F, such as Figure 4 As shown, the upper base is 3.2m wide, the lower base is 2.4m wide, and the height is 0.464m. The trapezoidal groove 7 has a total length of 13.0m. Figure 5 As shown, a 2cm steel plate 8 is first placed on the bottom surface of the trapezoidal groove, and then a 43kg steel rail 9 is installed on the steel plate 8 for shield translation. The end of the 2cm steel plate 8 is welded to the bracket for reinforcement to prevent the steel plate 8 from moving forward due to excessive friction during shield translation. At the same time, the steel plate 8 is welded to the pre-embedded steel bars in the backfill surface for reinforcement. By setting the steel rail 9 in the trapezoidal groove 7 of section F, it can be used to support the shield body 5 pushed out from the launching bracket 13, which facilitates the subsequent welding of brackets and wheels 4 on both sides of the shield body 5.

[0050] At other different cross sections (E, D, G), trapezoidal grooves adapted to the bottom contour of the shield body 5 are also provided to prevent the shield body 5 from directly contacting the base surface.

[0051] Step 5: Install the wheels 4 Using a 100T hydraulic jack, the shield body 5 was reverse-pushed and moved into section F, as follows. Figure 6 As shown, after the tunnel boring machine (TBM) is lifted 0.298m using a 200T jack, wheels 4 are installed at the bottom of the first bracket 1. Wheels 4 are connected to the first bracket 1 of the shield body 5 using snap-fit ​​welding; wheels 4 are TBM platform wheels. To prevent the 200T jack from retracting under pressure during wheel welding, four temporary support cylinders 11 are fabricated, such as... Figure 7 As shown, the temporary support cylinder 11 and the lifting jack 3 are placed side by side under the second bracket 2 to raise the shield body 5. Tracks 10 are installed on both sides of the trapezoidal groove 7, allowing the wheels 4 to move along them. The tracks 10 extend to sections E and D. After the wheels are welded to the brackets of the shield body 5, the support cylinder is retracted, and a 100T hydraulic jack is used to move the shield body 5 horizontally along the tracks 10 on both sides to the junction of sections D and G.

[0052] Step 6: Shield body 5 passes through section G of the mining tunnel. like Figure 9 , Figure 10 As shown, due to the different backfill heights of sections D and G in the mining method tunnel, there is a 0.35m elevation difference (section D is the first section, and section G is the second section). Firstly, a 1.2m long platform (i.e., the first platform 6) is constructed at section G using a 0.35m high spiral steel cylinder, making sections D and G the same elevation. Then, the front shield wheel of shield body 5 passes through section D and stops on the steel cylinder at section G. Lifting jacks 3 are then used to lift shield body 5. Figure 11 As shown; under the support of the lifting jack 3, the wheel bracket (i.e., the first bracket 1) is raised by 0.35m, and then the lifting jack 3 is retracted so that the front shield wheel is supported on the track 10 of section G, as shown. Figure 12 As shown; drive the shield body 5 to move forward 1.4m along the track 10 in section G, then place the platform in its original position. After the shield wheel in the shield body 5 passes section D and stops on the platform, use the lifting jack 3 to lift the shield body 5 as a whole, remove the platform, add 0.35m to the shield wheel bracket, and finally retract the lifting jack 3. Then use a 100T hydraulic jack to push the shield body 5 forward and move it to the shield tunneling starting section of section G.

[0053] Step 7: Shield 5 descends to rail 9 In this embodiment, the elevation of shield 5 during translation is 0.64m higher than that at launch. Therefore, the higher-elevation shield 5 needs to be lowered to the rail 9 within the trapezoidal groove for support. Once shield 5 has been translated to the shield launch position, the hydraulic cylinder of the lifting jack 3 is extended to its maximum stroke, and a 0.46m high support cylinder is placed on top. Figure 13 As shown; under the support of the lifting jack 3, the raised part of the first bracket 1 is cut off, then the hydraulic cylinder of the lifting jack 3 is retracted, and the wheel 4 is placed back on the track 10 of section G. If necessary, the track 10 can be raised; the pad above the lifting jack 3 is removed, and the lifting jack 3 is raised again to lift the second bracket 2, then the wheel on the shield body 5 is cut off and the track 10 below is removed; finally, the hydraulic cylinder of the jack is retracted, and the shield body 5 is lowered onto the steel rail 9 in the trapezoidal groove.

[0054] Step 8: Backfilling The tunnel boring machine was moved to the starting end position, and the pre-reserved grooves at the starting shaft opening and sections F, E, D, and G of the mining method tunnel were backfilled to the design elevation. Figure 15 As shown; then, the track 10 is installed to transport the tunnel boring machine trolley to section G and connect it with the shield body 5 for debugging. Only after the online debugging can the second launch be carried out.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for multi-section stepped shield tunneling translation construction, characterized in that, Including the following steps: S1: Set a trapezoidal groove (7) that is compatible with the outline of the shield body (5) on the base surface of the section near the starting shaft pit. Set a steel plate (8) on the bottom surface of the trapezoidal groove (7) and install a steel rail (9) on the steel plate (8) to support the shield translation. Weld the end of the steel plate (8) to the starting bracket (13) and fix it. Push the shield body (5) from the starting bracket (13) onto the steel rail (9). Set a wheel (4), a first bracket (1) and a second bracket (2) at the bottom of the shield body (5). The first bracket (1) and the second bracket (2) are integrally connected to the shield body (5). The second bracket (2) is located on the side of the first bracket (1) away from the center line of the shield body. The wheel (4) is integrally connected to the bottom of the first bracket (1). S2: Drive the shield (5) to move along the track (10) on the first section to the junction with the second section, where the bottom elevation of the first section is higher than the bottom elevation of the second section; First, a first platform (6) is erected on the second section so that the top surface of the first platform (6) and the bottom elevation of the first section are at the same elevation. Then, a track (10) is laid on the first platform (6) to connect with the track (10) on the first section. The wheels (4) in the front shield of the shield body (5) are driven to pass through the first section and stop on the first platform (6). S3: At the position of the second corbel (2), use the lifting jack (3) to raise the shield body (5) as a whole. The lifting jack (3) is located outside the first platform (6). Then, remove the first platform (6), set up a temporary track at the original position of the first platform (6), connect the temporary track with the track (10) in the second section, and raise the first corbel (1) on the front shield to make up for the height difference between the first section and the second section. S4: Drive the lifting jack (3) to restore the shield (5) to its original height. The wheels (4) of the front shield after being raised can cooperate with the temporary track. After moving the shield (5) forward a certain distance, remove the temporary track and place the first platform (6) in its original position. S5: Drive the wheel (4) of the shield in the shield body (5) through the first section and stop on the first platform (6), repeat step S3, raise the first bracket (1) on the shield, and retract the lifting jack (3) to realize the translation of the shield body (5) to the second section; after step S5, the step of lowering the shield body (5) onto the rail (9) is also included: S61: Construct a second platform on both sides of the starting position and lay a track (10) on the second platform to move the shield body (5) to the shield starting position section; S62: Under the second bracket (2), extend the cylinder of the lifting jack (3) to its maximum stroke, and place a pad between the lifting jack (3) and the second bracket (2). Under the support of the lifting jack (3) and the pad, remove the raised part of the second platform and the first bracket (1). S63: Retract the lifting jack (3) and place the wheel (4) back on the track (10) of the second platform; S64: Under the support of the wheel (4), remove the pad cylinder so that the lifting jack (3) can be extended again to support the second cow leg (2); S65: Under the support of the lifting jack (3), the second platform and wheels (4) are removed again. S66: Retract the lifting jack (3) again to bring the shield (5) into contact with the rail (9).

2. The method for multi-section stepped shield tunneling translation construction according to claim 1, characterized in that, Before step S1, the steps also include backfilling the launching well pit and setting the launching bracket (13).

3. The method for multi-section stepped shield tunneling translation construction according to claim 2, characterized in that, C35 concrete was used for backfilling the foundation pit of the launching well.

4. The method for multi-section stepped shield tunneling translation construction according to claim 2, characterized in that, One end of the launching bracket (13) is connected to the section cut, and the other end is connected to the side wall of the launching well through double H-beams (12).

5. The method for multi-section stepped shield tunneling translation construction according to claim 1, characterized in that, In step S1, after the shield (5) is moved onto the rail (9), the wheels (4) are installed: the shield (5) is raised using a jack, the wheels (4) are installed, and the rail (10) is installed at the bottom of the wheels (4) so ​​that the shield (5) moves along the rail (10).

6. The method for multi-section stepped shield tunneling translation construction according to claim 5, characterized in that, The process of raising the shield (5) also includes the step of setting a temporary pad (11) between the second corbel (2) and the base surface.

7. A method for multi-section stepped shield tunneling translation construction according to any one of claims 1-6, characterized in that, After step S5, a backfilling step is also included: the tunnel boring machine is moved to the starting end position, and then the starting well opening and the grooves of each section are backfilled to the design height.

8. The method for multi-section stepped shield tunneling translation construction according to claim 7, characterized in that, It also includes the following steps: after the cross section is backfilled, the track is installed again to transport the shield machine trolley to the starting position, and the shield machine trolley is connected to the shield body (5) for debugging.

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